Substances are either elements or mixtures. _______________

When lightning converts oxygen gas, O₂, into ozone, O₃, it is a physical change. _______________

A fruit salad is a homogeneous mixture. _______________

The state of matter is an example of a physical property. _______________

Ice, liquid water, and water vapor are the three states of water. _______________

Burning wood is an example of physical change. _______________

Which of the following is NOT part of an atom?

All atoms have the same number of _____.

Which of the following is NOT matter?

Which of the following is considered a building block of matter?

Which of the following is NOT an aspect of the state of matter that can be used to separate mixtures?

Which of the following is NOT an aspect of density that can be used to separate mixtures?

Which of the following methods to separate mixtures is NOT an aspect of solubility?

A sample of water has a mass of 193 g. Salt is added to the water, and the final solution weighs 238 g. How much salt was added?

A cup of orange juice weighs 250 g. Three cubes of ice weigh 10 g each. How much does the cup of orange juice weigh after the ice is added?

Solution A has a mass of _____ g. Solution B has a mass of 60 g. When they are mixed, the total mass is 120 g. Find the mass of Solution A.

When atoms rearrange and bond into new substances, the process is called a _____.

In a chemical equation, the formulas to the left of the arrow represent the _____.

In a chemical equation, the formulas to the right of the arrow represent the _____.

Which of the following is NOT a factor that affects the rate of a chemical reaction?

The amount of substance in a certain volume is the _____.

You can speed up a reaction if you break the solid reactant up into smaller pieces. Which factor does this describe?

The shape of an apple is a _____.

When a log burns in a fire, _____.

_____ is another name for a homogeneous mixture.

When two or more substances are combined so each substance can be separated by physical means, the result is a(n) _____.

The measurement of an object's mass is a _____.

The ability of an apple to change color when exposed to air is a _____.

The ability of a pond to freeze over in winter is a _____.

Which of the following is NOT a possible sign of a chemical change?

When a newspaper is left in direct sunlight for a few days, the paper begins to turn yellow. The yellow color is evidence of a _____.

Three examples of physical change are _____.

When a chunk of dry ice is at room temperature, a cloud of carbon dioxide vapor forms. The carbon dioxide is changing from a _____.

Matter is anything that has _______________ and takes up _______________.

In order to balance an equation, _______________ are changed.

Particles move faster when temperature is _______________.

The color of a material is an example of a ____________________ property.

The evaporation of water is an example of a change in ____________________.

What can differ between the atoms of different elements?

Josie has a bag of ice that weighs 5 pounds. She left it in a sealed container and it melted. How much does the resulting water weigh? How do you know this?

How can you tell if a chemical equation is balanced?

Sometimes people collect items such as eggshells, lawn clippings, and leaves into a compost heap in the backyard. The pile should be turned over once or twice a year to release heat that builds up in the center. What do you think is happening inside the compost pile?

Suppose a customer brings a gold bracelet to a jeweler and asks for it to be changed into a gold ring. What property will distinguish the ring from the bracelet? Will the changes required be physical or chemical? Explain your answer.

Rock candy is made by crystallizing sugar out of a sugar-water solution. If the initial solution weighs 485 grams and the leftover water weighs 94 grams, how much rock candy is made?

Explain the differences between physical changes and chemical changes. Include definitions of physical and chemical properties and changes.